This scale model was entirely designed in Alibre Design using old photographs and old documents.
If you look at this picture from something else than a smartphone or small tablet, don't forget that the real height of this miniature is about an inch...
The big picture shows well my (...) painting skills...If you are interested, this miniature can be bought as a kit at
https://www.shapeways.com/product/R6KQFVQ55/1-87-h0-swiss-trolleybus
